{"publication":"Monthly Notices of the Royal Astronomical Society","file":[{"file_size":2787493,"creator":"dernst","access_level":"open_access","date_created":"2026-02-09T08:39:19Z","checksum":"4cbade43244eaa8b60bb05a90ae613da","success":1,"relation":"main_file","file_id":"21169","content_type":"application/pdf","date_updated":"2026-02-09T08:39:19Z","file_name":"2025_MonthlyNoticesRAS_HerardDemanche.pdf"}],"_id":"21063","date_created":"2026-01-28T15:25:53Z","OA_type":"gold","publication_status":"published","acknowledgement":"We are grateful to Roberto Neri and collaborators for providing us with spatially resolved information on both the dust-continuum and [C ii] line emission from their high spatial resolution PdBI observations. This project was made possible in part by the Leiden University Fund/Bouwens Astrophysics Fund. RJB acknowledges support from NWO grants 600.065.140.11N211 (vrij competitie) and TOP grant TOP1.16.057. The Cosmic Dawn Center (DAWN) is funded by the Danish National Research Foundation under grant no. 140. Cloud-based data processing and file storage for this work is provided by the AWS Cloud Credits for Research program. Support for this work was provided by NASA through grant JWST-GO-01895 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5–26555. RPN acknowledges funding from JWST programs GO-1933 and GO-2279. Support for this work was provided by NASA through the NASA Hubble Fellowship grant HST-HF2-51515.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. MS acknowledges support from the CIDEGENT/2021/059 grant, from project PID2019-109592GB-I00/AEI/10.13039/501100011033 from the Spanish Ministerio de Ciencia e Innovación – Agencia Estatal de Investigación. This study forms part of the Astrophysics and High Energy Physics programme and was supported by MCIN with funding from European Union NextGenerationEU (PRTR-C17.I1) and by Generalitat Valenciana under the project n. ASFAE/2022/025. RAM acknowledges support from the ERC Advanced Grant 740246 (Cosmic_Gas) and the Swiss National Science Foundation through project grant 200020_207349.\r\n\r\nThis work is based on observations made with the NASA/ESA/CSA JWST. The data were obtained from the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5–03127 for JWST. These observations are associated with program no. 1895.\r\n\r\nThis paper made use of several publicly available software packages. We are indebted to the respective authors for their work: ipython (Pérez & Granger 2007), matplotlib (Hunter 2007), numpy (Oliphant 2006), scipy (Virtanen et al. 2020), jupyter (Kluyver et al. 2016), astropy (Astropy Collaboration 2013, 2018), grizli (v1.7.11; Brammer 2018; Brammer et al. 2022), eazy (Brammer, van Dokkum & Coppi 2008), and SExtractor (Bertin & Arnouts 1996).","doi":"10.1093/mnras/staf030","language":[{"iso":"eng"}],"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","publication_identifier":{"issn":["0035-8711"],"eissn":["1365-2966"]},"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png"},"page":"788-808","year":"2025","abstract":[{"text":"We report the detection of a 13σ Hα emission line from HDF850.1 at z = 5.188 ± 0.001 using the FRESCO (First Reionization Era SpectroscopicallyComplete Observations) NIRCam F444W grism observations. Detection of Hα in HDF850.1 is noteworthy, given its high far-infrared (IR) luminosity, substantial dust obscuration, and the historical challenges in deriving its redshift.\r\nHDF850.1 shows a clear detection in the F444W imaging data, distributed between a northern and southern component, mirroring that seen in [C II] from the Plateau de Bure Interferometer. Modelling the spectral energy distribution of each component separately, we find that the northern component has a higher mass, star formation rate (SFR), and dust extinction than the southern component. The observed Hα emission appears to arise entirely from the less-obscured southern component and shows a similar \u0004v∼ + 130 km s −1 velocity offset to that seen for [C II] relative to the source systemic redshift. Leveraging Hα-derived redshiftsfrom FRESCO observations, we find that HDF850.1 isforming in one of the richest environments identified to date at z > 5, with 100 z = 5.17–5.20 galaxies distributed across 13 smaller structures and a ∼(15 cMpc)3 volume. Based on the evolution of analogous structures in cosmological simulations, the z = 5.17–5.20 structures seem likely to collapse into\r\na single > 1014M cluster by z ∼ 0. Comparing galaxy properties forming within this overdensity with those outside, we find the masses, SFRs, and UV luminosities inside the overdensity to be clearly higher. The prominence of Hα line emission from HDF850.1 and other known highly obscured z > 5 galaxies illustrates the potential of NIRCam-grism programs to map both\r\nthe early build-up of IR-luminous galaxies and overdense structures.","lang":"eng"}],"DOAJ_listed":"1","ddc":["520"],"citation":{"mla":"Herard-Demanche, Thomas, et al. “Mapping Dusty Galaxy Growth at z &#62; 5 with FRESCO: Detection of Hα in Submm Galaxy HDF850.1 and the Surrounding Overdense Structures.” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 537, no. 2, Oxford University Press, 2025, pp. 788–808, doi:<a href=\"https://doi.org/10.1093/mnras/staf030\">10.1093/mnras/staf030</a>.","ama":"Herard-Demanche T, Bouwens RJ, Oesch PA, et al. Mapping dusty galaxy growth at z &#62; 5 with FRESCO: Detection of Hα in submm galaxy HDF850.1 and the surrounding overdense structures. <i>Monthly Notices of the Royal Astronomical Society</i>. 2025;537(2):788-808. doi:<a href=\"https://doi.org/10.1093/mnras/staf030\">10.1093/mnras/staf030</a>","ieee":"T. Herard-Demanche <i>et al.</i>, “Mapping dusty galaxy growth at z &#62; 5 with FRESCO: Detection of Hα in submm galaxy HDF850.1 and the surrounding overdense structures,” <i>Monthly Notices of the Royal Astronomical Society</i>, vol. 537, no. 2. Oxford University Press, pp. 788–808, 2025.","apa":"Herard-Demanche, T., Bouwens, R. J., Oesch, P. A., Naidu, R. P., Decarli, R., Nelson, E. J., … Shivaei, I. (2025). Mapping dusty galaxy growth at z &#62; 5 with FRESCO: Detection of Hα in submm galaxy HDF850.1 and the surrounding overdense structures. <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press. <a href=\"https://doi.org/10.1093/mnras/staf030\">https://doi.org/10.1093/mnras/staf030</a>","short":"T. Herard-Demanche, R.J. Bouwens, P.A. Oesch, R.P. Naidu, R. Decarli, E.J. Nelson, G. Brammer, A. Weibel, M. Xiao, M. Stefanon, F. Walter, J.J. Matthee, R.A. Meyer, S. Wuyts, N. Reddy, L. Rowland, I. van Leeuwen, P.A. Haro, H. Dannerbauer, A.E. Shapley, J. Chisholm, P. van Dokkum, I. Labbe, G. Illingworth, D. Schaerer, I. Shivaei, Monthly Notices of the Royal Astronomical Society 537 (2025) 788–808.","chicago":"Herard-Demanche, Thomas, Rychard J Bouwens, Pascal A Oesch, Rohan P Naidu, Roberto Decarli, Erica J Nelson, Gabriel Brammer, et al. “Mapping Dusty Galaxy Growth at z &#62; 5 with FRESCO: Detection of Hα in Submm Galaxy HDF850.1 and the Surrounding Overdense Structures.” <i>Monthly Notices of the Royal Astronomical Society</i>. Oxford University Press, 2025. <a href=\"https://doi.org/10.1093/mnras/staf030\">https://doi.org/10.1093/mnras/staf030</a>.","ista":"Herard-Demanche T, Bouwens RJ, Oesch PA, Naidu RP, Decarli R, Nelson EJ, Brammer G, Weibel A, Xiao M, Stefanon M, Walter F, Matthee JJ, Meyer RA, Wuyts S, Reddy N, Rowland L, van Leeuwen I, Haro PA, Dannerbauer H, Shapley AE, Chisholm J, van Dokkum P, Labbe I, Illingworth G, Schaerer D, Shivaei I. 2025. Mapping dusty galaxy growth at z &#62; 5 with FRESCO: Detection of Hα in submm galaxy HDF850.1 and the surrounding overdense structures. Monthly Notices of the Royal Astronomical Society. 537(2), 788–808."},"file_date_updated":"2026-02-09T08:39:19Z","quality_controlled":"1","author":[{"last_name":"Herard-Demanche","first_name":"Thomas","full_name":"Herard-Demanche, Thomas"},{"last_name":"Bouwens","full_name":"Bouwens, Rychard J","first_name":"Rychard J"},{"last_name":"Oesch","first_name":"Pascal A","full_name":"Oesch, Pascal A"},{"first_name":"Rohan P","full_name":"Naidu, Rohan P","last_name":"Naidu"},{"last_name":"Decarli","full_name":"Decarli, Roberto","first_name":"Roberto"},{"last_name":"Nelson","first_name":"Erica J","full_name":"Nelson, Erica J"},{"full_name":"Brammer, Gabriel","first_name":"Gabriel","last_name":"Brammer"},{"first_name":"Andrea","full_name":"Weibel, Andrea","last_name":"Weibel"},{"first_name":"Mengyuan","full_name":"Xiao, Mengyuan","last_name":"Xiao"},{"last_name":"Stefanon","first_name":"Mauro","full_name":"Stefanon, Mauro"},{"last_name":"Walter","full_name":"Walter, Fabian","first_name":"Fabian"},{"last_name":"Matthee","id":"7439a258-f3c0-11ec-9501-9df22fe06720","full_name":"Matthee, Jorryt J","orcid":"0000-0003-2871-127X","first_name":"Jorryt J"},{"last_name":"Meyer","first_name":"Romain A","full_name":"Meyer, Romain A"},{"last_name":"Wuyts","full_name":"Wuyts, Stijn","first_name":"Stijn"},{"last_name":"Reddy","first_name":"Naveen","full_name":"Reddy, Naveen"},{"first_name":"Lucie","full_name":"Rowland, Lucie","last_name":"Rowland"},{"full_name":"van Leeuwen, Ivana","first_name":"Ivana","last_name":"van Leeuwen"},{"full_name":"Haro, Pablo Arrabal","first_name":"Pablo Arrabal","last_name":"Haro"},{"last_name":"Dannerbauer","full_name":"Dannerbauer, Helmut","first_name":"Helmut"},{"full_name":"Shapley, Alice E","first_name":"Alice E","last_name":"Shapley"},{"last_name":"Chisholm","first_name":"John","full_name":"Chisholm, John"},{"last_name":"van Dokkum","first_name":"Pieter","full_name":"van Dokkum, Pieter"},{"last_name":"Labbe","first_name":"Ivo","full_name":"Labbe, Ivo"},{"first_name":"Garth","full_name":"Illingworth, Garth","last_name":"Illingworth"},{"full_name":"Schaerer, Daniel","first_name":"Daniel","last_name":"Schaerer"},{"last_name":"Shivaei","full_name":"Shivaei, Irene","first_name":"Irene"}],"oa_version":"Published Version","article_type":"original","article_processing_charge":"Yes","month":"02","date_published":"2025-02-01T00:00:00Z","external_id":{"arxiv":["2309.04525"]},"title":"Mapping dusty galaxy growth at z > 5 with FRESCO: Detection of Hα in submm galaxy HDF850.1 and the surrounding overdense structures","oa":1,"department":[{"_id":"JoMa"}],"type":"journal_article","intvolume":"       537","day":"01","OA_place":"publisher","arxiv":1,"volume":537,"has_accepted_license":"1","date_updated":"2026-02-09T08:50:55Z","status":"public","publisher":"Oxford University Press","issue":"2","PlanS_conform":"1"}